<template>
  <view>
    <view class="goods-item">
      <!-- 商品左侧图片区域 -->
      <view class="goods-item-left">
        <!-- 使用 v-if 指令控制 radio 组件的显示与隐藏 -->
        <!-- 存储在购物车中的商品，包含 goods_state 属性，表示商品的勾选状态 -->
        <radio :checked="goods.goods_state" color="#C00000" v-if="showRadio" @click="radioChangeHandler"></radio>
        <image :src="goods.goods_small_logo||defaultPic" class="goods-pic"></image>
      </view>
      <!-- 商品右侧信息区域 -->
      <view class="goods-item-right">
        <!-- 商品标题 -->
        <view class="goods-name">{{goods.goods_name}}</view>
        <view class="goods-info-box">
          <!-- 商品价格 -->
          <view class="goods-price">￥{{goods.goods_price|tofixed}}</view>
          <!-- 商品数量 -->
          <uni-number-box :min="1" :value="goods.goods_count" @change="numChangeHandler" v-if="showNum"></uni-number-box>
        </view>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    name: "my-goods",
    //定义props属性,用来接收外界传递到当前组件的数据
    props: {
      goods: { //商品的信息对象
        type: Object,
        default: {},
      },
      //是否展示图片左侧的radio
      showRadio:{
        type:Boolean,
        //如果外界没有指定show-radio属性的值,则默认不展示radio组件
        default:false,
      },
      showNum:{//是否展示价格右侧的NumberBox组件
        type:Boolean,
        default:false
      }
    },
    data() {
      return {
        //默认的空图片
        defaultPic: 'https://img3.doubanio.com/f/movie/8dd0c794499fe925ae2ae89ee30cd225750457b4/pics/movie/celebrity-default-medium.png',
      };
    },
    filters:{
      //把数字处理为带两位小数点的数字
      tofixed(num){
        return Number(num).toFixed(2)
      }
    },
    methods:{
      radioChangeHandler(){//radio组件的点击事件处理函数
      //通过this.$emit()触发外界通过@绑定的radio-change事件,
      //同时把商品的id和勾选状态作为参数传递给radio-change事件处理函数
        this.$emit('radio-change',{
          goods_id:this.goods.goods_id,//商品的id
          goods_state:!this.goods.goods_state//商品最新的勾选状态
        })
      },
      numChangeHandler(val){//NumberBox组件的change事件处理函数
        //通过this.$emit()触发外界通过@绑定的num-change事件
        this.$emit('num-change',{
          goods_id : this.goods.goods_id,//商品的id
          goods_count : +val//商品的最新数量
        })
      }
    }
  }
</script>

<style lang="scss">
  .goods-item {
    //让goods-item项占满整个屏幕的宽度
    width: 750rpx;
    //设置盒模型为border-box
    box-sizing: border-box;
    display: flex;
    padding: 10px 5px;
    border-bottom: 1px solid #f0f0f0;

    .goods-item-left {
      margin-right: 5px;
      //布局购物车页面
      display: flex;
      justify-content: space-between;
      align-items: center;

      .goods-pic {
        width: 100px;
        height: 100px;
        display: block;
      }
    }

    .goods-item-right {
      display: flex;
      flex-direction: column;
      justify-content: space-between;

      .goods-name {
        font-size: 13px;
      }
      
      .goods-info-box{
        display: flex;
        align-items: center;
        justify-content: space-between;
      }

      .goods-price {
        font-size: 16px;
        color: #C00000;
      }
    }
  }
</style>
